I have the European version and played with it and a US version demo. They are exactly the same except for the color.

My first modern racquet was the Aerogel 500 Tour, which I dearly love. I customarlity weight the head with a crapload of lead tape. It just fits my style of play (I grew up with the T-2000).

I have had my first 2 Bio 100s since just before Indian Wells. In fact, the first time I got to hit with it was on a clay court at the resort we were staying at. I immediately liked it as much or better than the AG 500T . . . without having to weight the head. I went back to the room and ordered 4 more of the European model.

I thought going from a 100 SI to a 90 SI would take a lot of adjusting. Turns out, not so much. I was immediately able to pop some really nice forehands that I was having trouble with using the 500T.

The only thing that took some getting used to whith the Bio 100 was my serve. Solution ... hit a couple of hundred serves. Now I am constantly getting comments on how much more pop my serve has.

Only once in a while do I hit an errant shot that I know in my head I would have made with the 500T. One the other side, I have made some pretty fantastic shots with the Bio 100 that I am sure I would have missed with the Aerogel.

The Bio 100 seems to give me a lot more control on 98 percent of my shots. It does have a bit less power, so I dropped my string tension a few pounds and the power was back ... but still with the control I had benn missing.

Let me put it to you this way on how much I like the Bio 100 . . . I am about a 3.5 player, but this week I went up against a 4.5 and was able to hold my own with the new stick. I lost, but 7-6(5),5-7,3-6.

Sorry if I got off track a little, but I love this new racquet. I guess all the new technology does occasionally benefit a club player like me.

Back to the original point . . .

I played with the US Bio 100 and my Euro Bio 100 at the TW tent in Indian Wells and there was no noticable difference other than the color of the paint.

According to the Dunlop rep, the original run of the Bio 100s were given the green paint job. It was then decided that it was to close to the Bio 400 models and they decided to change the color on the 100 to a more blue-green color to avoid confusion.

Personally, I would like the teal color if the racquet was predominemtly white instead of black. I just didn't think that it looked that good against the black. Hence my latching on to as many European versions as I could afford.

All of the green color 100s were sent to Europe, and the teal color ones were released in the US. They are the same racquet with a little difference in the paint color. Plain and simple.

Where is one notable difference between the two . . . the Euro version takes a few days longer to get here. Plus, if you order any clothing, like say t-shirts, they get heald up in customs and they have to call you to verify your order when it arrives at it's point of entery.

Nah this is definitely cool rambling. I couldn't wait when the line was coming out so I bought them in Canada which were the green one. Eventually all the US sellers had the blue version. I wanted to keep with the green wanted to know if I was missing anything. Appreciate the feedback though!